pipebuffer: More robust face null pointers.

It is really the caller responsibility not to call pipebuffer with null
buffers, etc. But don't let the crash happen here, and still asserting
early.

diff --git a/src/gallium/auxiliary/pipebuffer/pb_buffer.h b/src/gallium/auxiliary/pipebuffer/pb_buffer.h
index 49705cb862733b30a953b6d77cf7c3dec8fe2bdb..857ea53c7865778526ac92e11576777d9cbdc670 100644 (file)
--- a/src/gallium/auxiliary/pipebuffer/pb_buffer.h
+++ b/src/gallium/auxiliary/pipebuffer/pb_buffer.h
@@ -146,6 +146,8 @@ pb_map(struct pb_buffer *buf,
        unsigned flags)
 {
    assert(buf);
+   if(!buf)
+      return NULL;
    return buf->vtbl->map(buf, flags);
 }
 
@@ -154,6 +156,8 @@ static INLINE void
 pb_unmap(struct pb_buffer *buf)
 {
    assert(buf);
+   if(!buf)
+      return;
    buf->vtbl->unmap(buf);
 }
 
@@ -163,6 +167,12 @@ pb_get_base_buffer( struct pb_buffer *buf,
                    struct pb_buffer **base_buf,
                    unsigned *offset )
 {
+   assert(buf);
+   if(!buf) {
+      base_buf = NULL;
+      offset = 0;
+      return;
+   }
    buf->vtbl->get_base_buffer(buf, base_buf, offset);
 }
 
@@ -171,7 +181,8 @@ static INLINE void
 pb_destroy(struct pb_buffer *buf)
 {
    assert(buf);
-   assert(buf->vtbl);
+   if(!buf)
+      return;
    buf->vtbl->destroy(buf);
 }